名师谈中考英语动词时态正确理解与使用

　南开中学 李士明

　　CORRECT USAGE OF TENSES OF THE PREDICATES

　　如何学好情态动词

　　(Modal verbs)

　　can: 从客观角度陈述人们都了解的客观事实

　　can 表示客观能力, 与先天、后天能力无关。

　　Birds can fly up into the sky easily.

　　鸟儿可以轻易地飞到天上去。

　　Luke can speak Chinese very fluently.

　　鲁克的汉语说得很流利。

　　can表示人人都了解的客观可能性或听话人已知的客观事实。

　　If you are brave enough, all difficulties can be overcome.

　　如果你不畏艰险，所有的困难都一定会克服。

　　Correct ideas can be transformed into a material force that changes the world.

　　正确的理念一定能够转化为改变世界的物质力量。

　　I hear that you are going to Thailand. It can be dangerous to be there, I think.

　　听说你要去泰国，我看到那儿去挺危险的。

　　may: 表示说听双方均不确切，相当于I am not sure

　　推测或了解可能性

　　The man you are looking for may be in that room.

　　May I have a talk with you?

　　He may never succeed without your help.

　　基于may自身的不确定性，常置于句首，用来表示祝愿

　　May success attend you! 祝你成功！

　　(May) God bless you! 愿上帝保佑你！

　　You can/may come at any time. (口语中can和may从不同含义角度均可使用。)

　　ought to: 从客观角度表示安排、责任或义务

　　You ought to do the cleaning after school because you are on duty.

　　你放学后应该做卫生，因为今天你值日。

　　You ought not to write so carelessly.

　　(It is the students’ responsibility.学生应该做好的事)

　　Everybody should /ought to help each other in the study, shouldn’t / oughtn’t they?

　　(在反义疑问句中should和ought to有时可以前后交叉使用，起到主客观互补的作用)